Cortical dynamics of figure-ground segmentation: shine-through.
The shine-through effect occurs when a brief offset vernier target is followed by a grating of non-offset vernier elements. Rather than mask the target, this stimulus sequence produces a percept of the target vernier occluding the mask elements. We analyzed the dynamics of the 3D LAMINART model of depth perception and found that it explains the appearance of shine-through for these stimuli. The model explanation proposes that shine-through is due to a combination of false binocular disparity matches between the target and the central element of the mask, and a weakening of between disparity competition due to spatial competition and boundary grouping. Simulations of the model demonstrate that its behavior closely matches empirical data on the properties of shine-through. The model is contrasted with an alternative explanation of shine-through, and novel mask conditions are studied that allow for empirical tests of the model hypotheses.
Francis
Gregory
G
Department of Psychological Sciences, Purdue University, 703 Third Street, West Lafayette, IN 47907-2004, USA. gfrancis@purdue.edu
D004192:Discrimination, Psychological; D005403:Fixation, Ocular / Q000502:physiology; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D008960:Models, Psychological; D009903:Optical Illusions; D010470:Perceptual Masking / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics; D015348:Vision, Binocular / Q000502:physiology